Fast Phone Docker -- Grip v3

UPDATE: There is a newer version of this available. Please see [Fast Phone Docker v5](https://www.thingiverse.com/thing:6852375) for the latest

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This is an updated Fast Phone Docker -- It's easier to print, and more tolerant of errors.

It will work for all phones, but the back was specially designed not to block the back cameras for phones such as the iPhone or Google Pixel -- so if you have one of those, it doubles as a tripod.

A really big update for this is that the dimensions are now adjustable post print. This means if the plastic shrinks over time (like most plastics do), it's a simple adjustment to fix it. You no longer have to oversize or use specialty plastics. You do need some 6-32 x 1/4" bolts to secure the sliders though.

Again, this is the Grip part of the docker. You'll also need a mount (see [here](https://www.thingiverse.com/thing:4140427), or you can build your own).

If you do want to use the back camera, and your phone has a center-moun